:root {
  color-scheme: light;
  --bg: #f3f5f9;
  --card: #ffffff;
  --ink: #1b1f27;
  --muted: #667085;
  --line: #e2e7f0;
  --accent: #2563eb;
  --accent-ink: #ffffff;
  --accent-soft: #eaf0ff;
  --ok: #15803d;
  --danger: #b42318;
  --danger-soft: #fef3f2;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06);
  font: 16px/1.55 "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #14171c;
  --card: #1d222a;
  --ink: #edf1f7;
  --muted: #9aa4b4;
  --line: #2c333e;
  --accent: #7aa2ff;
  --accent-ink: #0d1220;
  --accent-soft: #1d2942;
  --ok: #4ade80;
  --danger: #ffb4ab;
  --danger-soft: #3a1f1e;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 28px rgba(0, 0, 0, .35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --bg: #14171c;
    --card: #1d222a;
    --ink: #edf1f7;
    --muted: #9aa4b4;
    --line: #2c333e;
    --accent: #7aa2ff;
    --accent-ink: #0d1220;
    --accent-soft: #1d2942;
    --ok: #4ade80;
    --danger: #ffb4ab;
    --danger-soft: #3a1f1e;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 28px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  overflow-wrap: break-word;
}

.board {
  max-width: 560px;
  margin: 0 auto;
  padding: max(16px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom));
  display: grid;
  gap: 14px;
}

.head { display: grid; gap: 10px; }

.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }

.mark {
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent);
  color: var(--accent-ink);
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 700;
}

.brand-text { min-width: 0; }

h1 { margin: 0; font-size: 22px; line-height: 1.25; letter-spacing: .01em; }

.sub { margin: 2px 0 0; color: var(--muted); font-size: 13px; }

.status {
  margin: 0;
  justify-self: start;
  max-width: 100%;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--muted);
  font-size: 12px;
}
.status[data-state="connected"] { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, var(--line)); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 16px;
}

.form { display: grid; gap: 14px; }

.field { display: grid; gap: 6px; }

label { font-size: 14px; font-weight: 600; }

.input-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg);
  padding: 0 12px;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.input-wrap:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

input {
  flex: 1;
  min-width: 0;
  width: 100%;
  height: 46px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 17px;
  font-variant-numeric: tabular-nums;
}
input:focus { outline: none; }
input::placeholder { color: var(--muted); opacity: .8; }

.unit { flex: none; color: var(--muted); font-size: 13px; }

.hint { margin: 0; color: var(--muted); font-size: 12px; }

input[aria-invalid="true"] { color: var(--danger); }
.input-wrap:has(input[aria-invalid="true"]) { border-color: var(--danger); background: var(--danger-soft); }

.error {
  margin: 0;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 13px;
}

.primary {
  min-height: 48px;
  border: 0;
  border-radius: 12px;
  background: var(--accent);
  color: var(--accent-ink);
  font: inherit;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  transition: filter .15s ease, transform .05s ease;
}
.primary:hover { filter: brightness(1.05); }
.primary:active { transform: translateY(1px); }
.primary:focus-visible, input:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.result { display: grid; gap: 12px; }

.placeholder { margin: 0; color: var(--muted); font-size: 14px; }

.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.stat {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: var(--bg);
}

.label { display: block; color: var(--muted); font-size: 12px; letter-spacing: .02em; }

.value {
  margin: 4px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  min-width: 0;
}

.value strong {
  font-size: clamp(28px, 9vw, 40px);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.value .unit { font-size: 13px; }

.detail { margin: 0; color: var(--muted); font-size: 13px; }

.foot { margin: 2px 2px 0; color: var(--muted); font-size: 12px; }

@media (max-width: 359px) {
  .board { padding-left: 12px; padding-right: 12px; }
  .stats { gap: 8px; }
  .stat { padding: 10px; }
  h1 { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}